[ケイーティーきょうかい(K−T境界);ケイティーきょうかい(KT境界), kei-tei-kyoukai ( K-T kyoukai ); keitei-kyoukai ( KT kyoukai )] (n) K-T boundary (between the Cretaceous Period and the Tertiary Period) [Add to Longdo]
Result from Foreign Dictionaries (2 entries found)
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Cretacic \Cre*tac"ic\
[Webster 1913 Suppl. +PJC]
{Cretaceous acid},
an old name for carbonic acid.
{Cretaceous formation} (Geol.), the series of strata of
various kinds, including beds of chalk, green sand, etc.,
formed in the Cretaceous period; -- called also the {chalk
formation}. See the Diagram under {Geology}.
{Cretaceous period} (Geol.), the time in the latter part of
the Mesozoic age during which the Cretaceous formation was
deposited, and at the end of which the dinosaurs died out.
See {Cretaceous}.
[1913 Webster +PJC]
From WordNet (r) 3.0 (2006) [wn]:
Cretaceous period
n 1: from 135 million to 63 million years ago; end of the age of
reptiles; appearance of modern insects and flowering plants
[syn: {Cretaceous}, {Cretaceous period}]
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